scala mnemonic

x.sc

object x {
  val mnem = Map(
    '2' -> "ABC", '3' -> "DEF", '4' -> "GHI", '5' -> "JKL",
    '6' -> "MNO", '7' -> "PQRS", '8' -> "TUV", '9' -> "WXYZ")
                                                  //> mnem  : scala.collection.immutable.Map[Char,String] = Map(8 -> TUV, 4 -> GHI
                                                  //| , 9 -> WXYZ, 5 -> JKL, 6 -> MNO, 2 -> ABC, 7 -> PQRS, 3 -> DEF)

  val charCode: Map[Char, Char] =
    for ((digit, str) <- mnem; lrt <- str) yield lrt -> digit
                                                  //> charCode  : Map[Char,Char] = Map(E -> 3, X -> 9, N -> 6, T -> 8, Y -> 9, J -
                                                  //| > 5, U -> 8, F -> 3, A -> 2, M -> 6, I -> 4, G -> 4, V -> 8, Q -> 7, L -> 5,
                                                  //|  B -> 2, P -> 7, C -> 2, H -> 4, W -> 9, K -> 5, R -> 7, O -> 6, D -> 3, Z -
                                                  //| > 9, S -> 7)

  charCode('E')                                   //> res0: Char = 3

  def wordCode(word: String): String =
    word.toUpperCase map charCode                 //> wordCode: (word: String)String

  wordCode("Java")                                //> res1: String = 5282
}